When ICE Source Address Filtering is enabled, STUN packets received during the connectivity check phase that do not match the addresses sent by the peer are still processed, but at a reduced rate. This allows
...
the
Spacevars
0
product
to learn of the presence of Peer Reflexive Candidates through STUN. This has no impact during a stable call when only packets received from the learned source address are processed and the remaining are dropped by default.